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MAGNETIC-RESONANCE DETERMINATION OF THE ELECTRONIC DENSITY OF STATES AND THE METAL NONMETAL TRANSITION IN THE LAH2-LAH3 SYSTEM
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UNSPECIFIED (1991) MAGNETIC-RESONANCE DETERMINATION OF THE ELECTRONIC DENSITY OF STATES AND THE METAL NONMETAL TRANSITION IN THE LAH2-LAH3 SYSTEM. In: INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS, SEP 02-07, 1990, BANFF, CANADA.
Full text not available from this repository.Abstract
Proton spin-lattice relaxation rate R1 and La-139 Knight shift measurements have been utilized to study the electronic density of states N(E(F)) at the Fermi level and the metal-non-metal (MNM) transition in the lanthanum hydrides, LaH(x)(2 less-than-or-equal-to x less-than-or-equal-to 3), in samples prepared from highest purity Ames Laboratory lanthanum as well as from lanthanum containing controlled low levels (less than 300 ppm) of gadolinium. In the pure samples, free-electron-like metallic behavior is found for all compositions up to x almost-equal-to 2.8 at temperatures T less-than-or-equal-to 200 K. In the gadolinium-doped samples the Gd3+ ion spin fluctuations, characterized by the ion spin-lattice relaxation time tau-i, contribute an additional proton spin relaxation rate. Measurements of this rate for x < 2.8 show that tau-i is-proportional-to T-1 at all temperatures, indicating metallic behavior. However, for x greater-than-or-equal-to 2.8 and T > 250 K, tau-i is-proportional-to T-5, showing that Gd3+ spin relaxation is then governed by the two-phonon process typical of insulating solids.
| Item Type: | Conference Item (UNSPECIFIED) |
|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TN Mining engineering. Metallurgy |
| Journal or Publication Title: | JOURNAL OF THE LESS-COMMON METALS |
| Publisher: | ELSEVIER SCIENCE SA LAUSANNE |
| ISSN: | 0022-5088 |
| Date: | 20 August 1991 |
| Volume: | 172 |
| Number: | Part A |
| Number of Pages: | 8 |
| Page Range: | pp. 411-418 |
| Publication Status: | Published |
| Title of Event: | INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS |
| Location of Event: | BANFF, CANADA |
| Date(s) of Event: | SEP 02-07, 1990 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/22478 |
Data sourced from Thomson Reuters' Web of Knowledge
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